Yes, it does. The rule is: GET and POST parameters are encoded in the charset of the page. Try this html page with your browser, alternatively with utf-8 and iso-8859-1: 
<head>
 <meta http-equiv="content-type"
       content="text/html; charset=iso-8859-1">
 <!-- meta http-equiv="content-type"
           content="text/html; charset=utf-8" -->
</head>
<body>
<script>
document.write(location.search + "<br>");
</script>
<form>
 <input type="hidden" name="test" value="&auml;">
 <input type="submit">
</form>
</body>

[download]

In reply to Re: Re: UTF-8 and URL encoding by eserte
in thread UTF-8 and URL encoding by linux454

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.